【(2a+b)的平方-(2a+b)(2a-b)】÷2b
=(4a²+4ab+b²-4a²+b²)÷2b
=(4ab+2b²)÷2b
=2a+b
=2*(-1/2)+3
=-1+3
=2
已知a=-2分之1,b=3,求【(2a=b)的平方-(2a=b)(2a-b)】÷2b的值
已知a=-2分之1,b=3,求【(2a=b)的平方-(2a=b)(2a-b)】÷2b的值
数学人气:984 ℃时间:2019-10-19 04:26:01
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